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Can I Use a Battery to Test the Light Wiring on My Trailer Without Connecting to Truck  

Question:

Can i use a battery and connect it to the trailer wiring to check the lights without connecting the truck to the trailer or use a battery charger to do the same.

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Expert Reply:

Yes you can use a 12V battery to test the lights. Connect the negative terminal on the battery to the trailer frame to complete the ground portion of the circuit. Then use a wire jumper to or circuit tester, like part # PTW2993, to bridge from the individual contacts on the trailer connector to the positive terminal of the battery.

expert reply by:
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Patrick B

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